SIM Tech SIMCom SIM868 Series - Default Chapter; Table of Contents

To Next Page

To Previous Page

Smart Machine Smart Decision

SIM868_Series_Hardware_Design_V1.06 2 2017-07-13

Contents

Introduction ........................................................................................................ 10

2. SIM868 Overview .............................................................................................. 10

2.1. SIM868 Key Features ......................................................................................................... 11

2.2. Operating Modes ................................................................................................................. 14

2.3. Functional Diagram............................................................................................................. 15

3. Package Information ......................................................................................... 16

3.1. Pin Out Diagram ................................................................................................................. 16

3.2. Pin Description .................................................................................................................... 17

3.3. Package Dimensions ........................................................................................................... 19

4. Application Modes of SIM868 .......................................................................... 22

4.1. All-in-one Mode .................................................................................................................. 22

4.2. Stand-alone Mode ............................................................................................................... 23

5. Application Interface of GSM .......................................................................... 24

5.1. Power Supply of GSM ........................................................................................................ 24

5.2. Reference Circuit of GSM Power Supply ........................................................................... 25

5.3. Power on/off GSM Part ....................................................................................................... 26

5.3.1. Power on GSM .................................................................................................................................... 26

5.3.2. Power off GSM ................................................................................................................................... 27

5.4. Power Saving Mode of GSM .............................................................................................. 28

5.4.1. Minimum Functionality Mode of GSM Part ....................................................................................... 28

5.5. Serial Port of GSM .............................................................................................................. 29

5.5.1. Function of Serial Port ........................................................................................................................ 30

5.5.2. Serial Interfaces ................................................................................................................................... 30

5.5.3. Debug Interface ................................................................................................................................... 32

5.5.4. Software Upgrade of GSM .................................................................................................................. 33

5.6. UART1_RI Behaviors ......................................................................................................... 33

5.7. Audio Interfaces .................................................................................................................. 34

5.7.1. Speaker Interfaces Configuration ........................................................................................................ 35

5.7.2. Microphone Interfaces Configuration ................................................................................................. 36

5.7.3. Audio Electronic Characteristic .......................................................................................................... 36

5.7.4. TDD Noise of GSM ............................................................................................................................ 36

5.8. SIM Card Interface.............................................................................................................. 37

5.8.1. SIM Card Application ......................................................................................................................... 37

5.8.2. SIM Card Design Guide ...................................................................................................................... 38

5.8.3. Design Considerations for SIM Card Holder ...................................................................................... 39

5.9. SD Interface ........................................................................................................................ 41

5.10. I2C Bus ............................................................................................................................... 41

5.11. ADC .................................................................................................................................... 41

SIMCOM CONFIDENTIAL FILE

Main Page